Formatting Numbers for Printing in Python
formatting a floating point number to a given level of precision:
To specify a level of precision, we need to use a colon ( : ).
followed by a decimal point.
along with some integer representing the degree of precision.
place this inside the curly braces for an f-string, after the value we want to format.
x = 4863.4343091 # example float to format
print (f"{ x :.6} ) # output: 4863.43
As we can see, our very long float got shortened down to just 6 figures.
If we specify fewer figures than we have in the integer portion of the float, we end up with an exponent representation instead: 4.86e+03
how do we specify 3 decimal places?
just need to add an f after number of decimal numbers i want.
example:
x = 4863.4343091
print (f"{ x :.3f} ) # 4863.434
seperators are used with large numbers for example 1000000
they seperate the number to make it easier to read : 1000 000
how to use them ?
add the seperator after ( : ).
example: print(f'{x:,}') # 1,000,000
it can work with floats as well: print(f" {x:,.3f}")
I can format the number to render as percintage, or add percentage after my number i do the following.
i swtich f(that stands for fixed) and add percentage(%)
example:
questions = 30
correct_answers = 23
print (f"You got { correct_answers / questions :.2%} )
# You got 76.67% correct!
When formatting a number as a percentage, the level of precision always refers to the number of digits after the decimal point.